1. Optics and Telescopes Chapter 5 Survey of Astronomy twlee2016@gmail.c om astro1010-lee.com

2. Optical Radio Infrared Ultraviolet X-Ray Gamma Ray Telescopes have been developed for every portion of the Electro-Magnetic Spectrum Optics and Telescopes Chapter 5 Survey of Astronomy twlee2016@gmail.c om astro1010-lee.com

3. Optics and Telescopes Telescopes on Mauna Kea Chapter 5 Survey of Astronomy twlee2016@gmail.c om astro1010-lee.com

4. Early Optical Telescopes use the Refraction property of waves to collect and focus light Optics and Telescopes Chapter 5 Survey of Astronomy twlee2016@gmail.c om astro1010-lee.com

5. A Refractor or Refracting Telescope Optics and Telescopes Chapter 5 Survey of Astronomy twlee2016@gmail.c om astro1010-lee.com

6. One of several difficulties with a lens is that it is a prism and colors bend at different rates. Another is that it is extremely difficult to obtain a large piece of glass that is of telescope quality. Optics and Telescopes Chapter 5 Survey of Astronomy twlee2016@gmail.c om astro1010-lee.com

7. Modern telescopes use the Reflective property of waves to gather and focus light. By correctly curving the mirror into a parabaloid shape light can be collected and focused. Optics and Telescopes Chapter 5 Survey of Astronomy twlee2016@gmail.c om astro1010-lee.com

8. There are several basic mounts for Reflector telescopes that have been invented. Some of them are shown below. Optics and Telescopes Chapter 5 Survey of Astronomy twlee2016@gmail.c om astro1010-lee.com

9. Optics and Telescopes Chapter 5 Survey of Astronomy twlee2016@gmail.c om astro1010-lee.com

10. Film has been replaced. Now data is digitized directly using a CCD (Charge Coupled Device). These, too, are becoming more and more sophisticated. Optics and Telescopes Chapter 5 Survey of Astronomy twlee2016@gmail.c om astro1010-lee.com

11. Larger telescopes are desirable to attain better resolution. The image (a) was obtained with a telescope twice the size of the telescope that took image (b) Optics and Telescopes Chapter 5 Survey of Astronomy twlee2016@gmail.c om astro1010-lee.com

12. Atmospheric blurring is often due to air movements. In the past this has limited the size of Earth based telescopes. Solutions have included telescopes on mountain tops and active optics. Optics and Telescopes Chapter 5 Survey of Astronomy twlee2016@gmail.c om astro1010-lee.com

13. The best solution to date has been Adaptive Optics that track atmospheric changes with a laser then adjust the shape of the mirror in real time to compensate. Optics and Telescopes Chapter 5 Survey of Astronomy twlee2016@gmail.c om astro1010-lee.com

14. The Earth’s Atmosphere effectively blocks most radiation from space. There is a window for visible light and a rather large window in the radio wavelengths that can be accessed from the ground. There are few infrared wavelengths that can be accessed from high mountains and high flying airplanes. The rest of the wavelengths can only be seen in space. Optics and Telescopes Chapter 5 Survey of Astronomy twlee2016@gmail.c om astro1010-lee.com

15. Much information can be obtained from Earth based Radio Telescopes using the radio window. Optics and Telescopes Chapter 5 Survey of Astronomy twlee2016@gmail.c om astro1010-lee.com

16. Radio telescopes are similar to optical reflecting telescopes but are less sensitive to imperfections in the receiver (due to the longer wavelengths) and they can be made very large Optics and Telescopes Chapter 5 Survey of Astronomy twlee2016@gmail.c om astro1010-lee.com

17. This is called the Very Large Array. It samples very long radio waves. This large array has the resolution of a telescope as large as the longest distance between dishes. Signals are welded together by interferometry as if they were coming from a single instrument. Optics and Telescopes Chapter 5 Survey of Astronomy twlee2016@gmail.c om astro1010-lee.com

18. Before adaptive optics and before the advent of the large land based optical telescopes, the Hubble Space Telescope was launched into orbit. It amazed the community. It is still doing an excellent job even as old as it is. The new scopes now are passing it by and they need much less expensive maintenance. Chapter 5 Survey of Astronomy twlee2016@gmail.c om astro1010-lee.com

19. Infrared Ultraviolet X-Ray Gamma Ray These are a few of the fleet of telescopes that now cover the wavelengths that can not be seen from the surface of the Earth. Optics and Telescopes Chapter 5 Survey of Astronomy twlee2016@gmail.c om astro1010-lee.com

20. Much can be learned from observing the same astronomical object at many wavelengths. Here is the Milky Way in several wavelengths. Optics and Telescopes Chapter 5 Survey of Astronomy twlee2016@gmail.c om astro1010-lee.com

21. End of Chapter 5 Chapter 5 Survey of Astronomy twlee2016@gmail.c om astro1010-lee.com